253 lines
7.2 KiB
C
253 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Intel OnChip System Fabric MailBox access support
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*/
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#ifndef IOSF_MBI_SYMS_H
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#define IOSF_MBI_SYMS_H
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#include <linux/notifier.h>
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#define MBI_MCR_OFFSET 0xD0
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#define MBI_MDR_OFFSET 0xD4
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#define MBI_MCRX_OFFSET 0xD8
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#define MBI_RD_MASK 0xFEFFFFFF
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#define MBI_WR_MASK 0X01000000
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#define MBI_MASK_HI 0xFFFFFF00
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#define MBI_MASK_LO 0x000000FF
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#define MBI_ENABLE 0xF0
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/* IOSF SB read/write opcodes */
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#define MBI_MMIO_READ 0x00
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#define MBI_MMIO_WRITE 0x01
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#define MBI_CFG_READ 0x04
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#define MBI_CFG_WRITE 0x05
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#define MBI_CR_READ 0x06
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#define MBI_CR_WRITE 0x07
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#define MBI_REG_READ 0x10
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#define MBI_REG_WRITE 0x11
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#define MBI_ESRAM_READ 0x12
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#define MBI_ESRAM_WRITE 0x13
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/* Baytrail available units */
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#define BT_MBI_UNIT_AUNIT 0x00
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#define BT_MBI_UNIT_SMC 0x01
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#define BT_MBI_UNIT_CPU 0x02
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#define BT_MBI_UNIT_BUNIT 0x03
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#define BT_MBI_UNIT_PMC 0x04
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#define BT_MBI_UNIT_GFX 0x06
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#define BT_MBI_UNIT_SMI 0x0C
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#define BT_MBI_UNIT_USB 0x43
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#define BT_MBI_UNIT_SATA 0xA3
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#define BT_MBI_UNIT_PCIE 0xA6
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/* Quark available units */
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#define QRK_MBI_UNIT_HBA 0x00
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#define QRK_MBI_UNIT_HB 0x03
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#define QRK_MBI_UNIT_RMU 0x04
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#define QRK_MBI_UNIT_MM 0x05
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#define QRK_MBI_UNIT_SOC 0x31
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/* Action values for the pmic_bus_access_notifier functions */
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#define MBI_PMIC_BUS_ACCESS_BEGIN 1
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#define MBI_PMIC_BUS_ACCESS_END 2
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#if IS_ENABLED(CONFIG_IOSF_MBI)
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bool iosf_mbi_available(void);
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/**
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* iosf_mbi_read() - MailBox Interface read command
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* @port: port indicating subunit being accessed
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* @opcode: port specific read or write opcode
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* @offset: register address offset
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* @mdr: register data to be read
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*
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* Locking is handled by spinlock - cannot sleep.
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* Return: Nonzero on error
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*/
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int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr);
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/**
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* iosf_mbi_write() - MailBox unmasked write command
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* @port: port indicating subunit being accessed
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* @opcode: port specific read or write opcode
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* @offset: register address offset
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* @mdr: register data to be written
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*
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* Locking is handled by spinlock - cannot sleep.
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* Return: Nonzero on error
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*/
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int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr);
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/**
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* iosf_mbi_modify() - MailBox masked write command
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* @port: port indicating subunit being accessed
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* @opcode: port specific read or write opcode
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* @offset: register address offset
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* @mdr: register data being modified
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* @mask: mask indicating bits in mdr to be modified
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*
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* Locking is handled by spinlock - cannot sleep.
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* Return: Nonzero on error
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*/
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int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask);
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/**
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* iosf_mbi_punit_acquire() - Acquire access to the P-Unit
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*
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* One some systems the P-Unit accesses the PMIC to change various voltages
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* through the same bus as other kernel drivers use for e.g. battery monitoring.
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*
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* If a driver sends requests to the P-Unit which require the P-Unit to access
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* the PMIC bus while another driver is also accessing the PMIC bus various bad
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* things happen.
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*
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* Call this function before sending requests to the P-Unit which may make it
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* access the PMIC, be it through iosf_mbi* functions or through other means.
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* This function will block all kernel access to the PMIC I2C bus, so that the
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* P-Unit can safely access the PMIC over the shared I2C bus.
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*
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* Note on these systems the i2c-bus driver will request a sempahore from the
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* P-Unit for exclusive access to the PMIC bus when i2c drivers are accessing
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* it, but this does not appear to be sufficient, we still need to avoid making
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* certain P-Unit requests during the access window to avoid problems.
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*
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* This function locks a mutex, as such it may sleep.
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*/
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void iosf_mbi_punit_acquire(void);
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/**
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* iosf_mbi_punit_release() - Release access to the P-Unit
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*/
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void iosf_mbi_punit_release(void);
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/**
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* iosf_mbi_block_punit_i2c_access() - Block P-Unit accesses to the PMIC bus
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*
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* Call this function to block P-Unit access to the PMIC I2C bus, so that the
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* kernel can safely access the PMIC over the shared I2C bus.
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*
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* This function acquires the P-Unit bus semaphore and notifies
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* pmic_bus_access_notifier listeners that they may no longer access the
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* P-Unit in a way which may cause it to access the shared I2C bus.
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*
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* Note this function may be called multiple times and the bus will not
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* be released until iosf_mbi_unblock_punit_i2c_access() has been called the
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* same amount of times.
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*
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* Return: Nonzero on error
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*/
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int iosf_mbi_block_punit_i2c_access(void);
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/*
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* iosf_mbi_unblock_punit_i2c_access() - Release PMIC I2C bus block
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*
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* Release i2c access block gotten through iosf_mbi_block_punit_i2c_access().
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*/
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void iosf_mbi_unblock_punit_i2c_access(void);
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/**
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* iosf_mbi_register_pmic_bus_access_notifier - Register PMIC bus notifier
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*
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* This function can be used by drivers which may need to acquire P-Unit
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* managed resources from interrupt context, where iosf_mbi_punit_acquire()
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* can not be used.
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*
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* This function allows a driver to register a notifier to get notified (in a
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* process context) before other drivers start accessing the PMIC bus.
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*
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* This allows the driver to acquire any resources, which it may need during
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* the window the other driver is accessing the PMIC, before hand.
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*
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* @nb: notifier_block to register
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*/
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int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb);
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/**
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* iosf_mbi_register_pmic_bus_access_notifier - Unregister PMIC bus notifier
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*
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* @nb: notifier_block to unregister
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*/
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int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb);
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/**
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* iosf_mbi_unregister_pmic_bus_access_notifier_unlocked - Unregister PMIC bus
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* notifier, unlocked
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*
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* Like iosf_mbi_unregister_pmic_bus_access_notifier(), but for use when the
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* caller has already called iosf_mbi_punit_acquire() itself.
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*
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* @nb: notifier_block to unregister
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*/
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int iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(
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struct notifier_block *nb);
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/**
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* iosf_mbi_assert_punit_acquired - Assert that the P-Unit has been acquired.
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*/
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void iosf_mbi_assert_punit_acquired(void);
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#else /* CONFIG_IOSF_MBI is not enabled */
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static inline
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bool iosf_mbi_available(void)
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{
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return false;
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}
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static inline
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int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr)
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{
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WARN(1, "IOSF_MBI driver not available");
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return -EPERM;
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}
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static inline
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int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr)
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{
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WARN(1, "IOSF_MBI driver not available");
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return -EPERM;
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}
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static inline
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int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask)
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{
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WARN(1, "IOSF_MBI driver not available");
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return -EPERM;
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}
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static inline void iosf_mbi_punit_acquire(void) {}
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static inline void iosf_mbi_punit_release(void) {}
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static inline
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int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline
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int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int
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iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(struct notifier_block *nb)
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{
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return 0;
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}
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static inline
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int iosf_mbi_call_pmic_bus_access_notifier_chain(unsigned long val, void *v)
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{
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return 0;
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}
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static inline void iosf_mbi_assert_punit_acquired(void) {}
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#endif /* CONFIG_IOSF_MBI */
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#endif /* IOSF_MBI_SYMS_H */
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